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x in (-oo:+oo)
12 = (1/3)*x // - (1/3)*x
12-((1/3)*x) = 0
(-1/3)*x+12 = 0
12-1/3*x = 0 // - 12
-1/3*x = -12 // : -1/3
x = -12/(-1/3)
x = 36
x = 36
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